An urban derivative of sneaky, but more commonly used when secret missions are on the plan.
Also associated is the snealy look, a look of supreme sneakiness with undertones of smugness and arousal. This has been adopted in favour over a handshake.

A common typo that occurs when someone is so excited about engaging in 'sneaky' activities, that when trying to explain their devious behaviours, their finger slips when attempting to hit the K button and press the L button instead, which is located directly beside it on a standard qwerty keyboard.

Jamie: 'Kristi, how did you manage to smoke an entire bowl of crack in front of the police station without getting caught??'

Kristi: 'It was simple! I pretended that I was having an asthma attack and disguised my crack pipe to make it look like an inhaler. I'm so snealy!'